Transposition pin



May 14; 1929. R. WEIMAR' TRANSPOSITION PIN original FiledAug. 31, 1927 Y Robert we/w fi M d/M (Tame.

Patented May 14, 1929.

UNITED STATES PATENT OFFICE.

RQBERT WEIMAR, OF SEATTLE, WASHINGTON.

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Application filed August 31, 1927, Serial No, 216,518. Renewed February 2, 1929.

My present invention relates to an improved transposition pin used in the installation of electric, telephone, telegraph and similar lines in connection with the insulator or insulators for holding the conductors or wires of the lines. The primary object of the invention is the provision of an interchangeable device for attachment to the cross arm of the pole or other wire support whereby either a single insulator or conductor-support may be supported above the cross arm or support, or a duplex insulator may be used, one above and one below the cross arm or support to which the wires are attached as usual. 4

By the utilization of the device of my invention both time and labor are saved in the crectionand installation of the lines, the material is provided in standardized parts that are adapted for use in varying conditions, andthe workman is enabled to perform functions with facility and convenience. The invention consists in certain novel combinations and arrangements of parts as will hereinafter be more fully set forth and claimed. In the accompanying drawings 1 have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and arranged both as a single and as a duplex conductor holder or insulator, according to the best modes I have. so far devised for the practical application of the principles of my invention.

Figure 1 is a View of a, portion of a cross arm with a single and a duplex conductor holder thereon arranged according to my invention.

Figure 2 is an enlarged sectional view of one of the duplex conductor holders adapted to support a wire both above and below the cross arm or other support.

Flgure 3 1s a deta l view of a single conductor holder showing the cross arm or sup-' port in section.

While "the conductor holders and transposition pin are adapted for use in connection with various kinds of supports, for convenience of-description I shall refer to the support 1 as the cross arm of a telegraph, telephone or power line poleto which the lines or wires are connected for support. Two insulators, as 2 and 3 are shown one above and the other below the cross arm,

which are fashioned of glass or other non conducting material with the usual annular groove 4 for the wire, and the skirt 5 below for shedding water. As shown in Figure 1 the insulators may be used either above the cross arm, or both above and below the arm in connection with a transposition pin which includes an upper bolt (3 having a flange or head 7 to rest upon the top face of the cross arm, and the lower, tubular or socket end 8 of the bolt extends through a hole 9 in the cross arm. The exteriorly threaded end 10 of the tubular bolt projects below the lower surface of. the cross arm, and a nut ll isused to clamp the tubular bolt in the hole of the cross arm.

The bolt is provided with a polygonal portion 12 above its flanged head 7 to accommodate a wrench, which holds the bolt while the clamp nut 11 is being turned on the threaded end 10. Between the metal of the bolt and the insulator 2 I provide a wooden plug or screw filler 13 which is threaded on the upper end of the bolt 6, and the insulator 2 in turn, is threaded on the exterior threads of the wooden plug 13.

These described parts of the transposition pin provide for a single insulator or con ductor holder used above the cross arm.

When the duplex insulators 2 and 3 are to be used both above and below the cross arm, other elements are added, including a lower bolt 14 that is threaded into the internally threaded, tubular, part 8 of the upper bolt, and which is provided with a polygonal head 15 for the accommodation of a wrench or other suitable tool. The lower bolt is also threaded to receive the wooden plug or sleeve 16 between the bolt and the insulator 3, and the bolt passes through an opening 17 in the top of the insulator. Between the insulator and the clamp nut 11, a gasket 18 is interposed to alford a cushion to prevent breakage of parts when the wrenclnis applied to the head 1."), the bolt of course beingpassed through the hole'in the gasket as well as through the hole in the nut 11. Thus the insulator 2 is supported in clamped position by means of the flanged head? and nut 11, and

the insulator 3 is supported in clamped posi Letters Patent. is-' 1. The combination with a cross arm havthreaded bolt portion having a head at one ing a hole therethrough of a bolt having a end and an open center nut at the other end tubular threaded portion projecting through of said bolt-portion, a bolt threaded into said said hole and an open center clamp-nut on tubular portion, an insulator carried by the the projecting part of the tubular bolt, a second bolt, and means whereby the second 15 second bolt threaded into the tubular por bolt is turned to clamp the insulator against tion of the first bolt, and insulators supportthe open center nut. ed on said bolts. In testimony whereof I afiix my signature.

2. The combination with a cross arm of a 10 transposition pin including a tubular, ROBERT WEIMAR. 

